On Sun, Mar 22, 2015 at 04:08:32AM +, Andrew Gierth wrote:
Bruce == Bruce Momjian br...@momjian.us writes:
! However, calculations on typenumeric/type values is very slow
arithmetic ... is, but calculations ... are
Ah, good point. Fixed an applied. Thanks.
--
Bruce
On Thu, Dec 18, 2014 at 11:51:12PM -0500, Tom Lane wrote:
If you're doing any sort of higher math or statistics, I stand by my
statement that you'd better think rather than just blindly assume that
numeric is going to be better for you. A moment's fooling about finds
this example, which is
Bruce == Bruce Momjian br...@momjian.us writes:
! However, calculations on typenumeric/type values is very slow
arithmetic ... is, but calculations ... are
--
Andrew (irc:RhodiumToad)
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To make changes to your
On Thu, Dec 18, 2014 at 11:51 PM, Tom Lane t...@sss.pgh.pa.us wrote:
What it boils down to is that numeric is great for storing given decimal
inputs exactly, and it can do exact addition/subtraction/multiplication
on those too, but as soon as you get into territory where the result is
Robert Haas robertmh...@gmail.com writes:
I think what it boils down to is that several people here (and I'll
add my voice to the chorus) are saying, hey, numeric is really useful,
and we'd like to be able to manipulate numerics without all the palloc
and fmgr overhead, and your response
On Fri, Dec 19, 2014 at 10:56 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Well, there are two components to what I'm saying. One is that the
example David started with looks like it could use some better-informed
consideration about which datatype to use. The other is that numeric
leaves quite a
On Thu, Dec 18, 2014 at 11:51:37PM -0300, Alvaro Herrera wrote:
Robert Haas wrote:
I think that's ridiculous. You're basically arguing that numeric
doesn't offer meaningful advantages over float8, which flies in
the face of the fact that essentially every database application
I've ever
On 12/18/14, 9:21 AM, Tom Lane wrote:
As it stands, no extension can use the numeric type in any non-trivial
way without paying a large penalty for repeated pallocs and data copies.
Given that the ability to write C extensions easily is one of pg's great
strengths, this is a defect that should
On Thu, Dec 18, 2014 at 10:21 AM, Tom Lane t...@sss.pgh.pa.us wrote:
Andrew Gierth and...@tao11.riddles.org.uk writes:
Tom == Tom Lane t...@sss.pgh.pa.us writes:
Tom If you're concerned about arithmetic performance, there is a
Tom very obvious fix here: use double.
Independently of this
Robert Haas wrote:
I think that's ridiculous. You're basically arguing that numeric
doesn't offer meaningful advantages over float8, which flies in the
face of the fact that essentially every database application I've ever
seen uses numeric and I'm not sure I've ever seen one using float8.
Robert Haas robertmh...@gmail.com writes:
On Thu, Dec 18, 2014 at 10:21 AM, Tom Lane t...@sss.pgh.pa.us wrote:
As the guy who last fooled with the numeric calculation algorithms in any
major way, I'm painfully aware that numeric is not necessarily more
accurate than double for anything more
Tom == Tom Lane t...@sss.pgh.pa.us writes:
Hmm. You'd want to make add_var, mul_var etc. non-static?
Tom -1 for that.
possibly with more meaningful names.
Tom If you're concerned about arithmetic performance, there is a
Tom very obvious fix here: use double.
Independently of this
On 12/16/2014 08:34 AM, David Fetter wrote:
Folks,
While noodling with some weighted statistics
https://github.com/davidfetter/weighted_stats, I noticed I was
having to jump through a lot of hoops because of all the private
methods in numeric.c, especially NumericVar. Would there be some
major
Heikki == Heikki Linnakangas hlinnakan...@vmware.com writes:
Heikki Looking at the weighed_stats code, this probably illustrates
Heikki the hoops you had to jump through:
Actually that hoop-jumping expression is almost irrelevant.
The part that hurts (and yes, it's performance that's at
On Tue, Dec 16, 2014 at 09:01:47AM +, Andrew Gierth wrote:
Heikki == Heikki Linnakangas hlinnakan...@vmware.com writes:
Heikki Looking at the weighed_stats code, this probably illustrates
Heikki the hoops you had to jump through:
Actually that hoop-jumping expression is almost
Heikki Linnakangas hlinnakan...@vmware.com writes:
On 12/16/2014 08:34 AM, David Fetter wrote:
While noodling with some weighted statistics
https://github.com/davidfetter/weighted_stats, I noticed I was
having to jump through a lot of hoops because of all the private
methods in numeric.c,
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